Darius Starzak is a former professor of religious philosophy at the University of Kraków. He was fired to gain membership into the Cult of Moloch. Dexter Morgan was after him, after he tailed him and crashed his car in the canal. He is believed to have killed a lot of children in Bosnia, as Dexter confirmed by his Interpol profile.
Dexter tried to kill him in his usual plastic room and fillet knife but because his Dark Passenger had left him, he was unable to go through with it.
Later at the end when Dexter infiltrated the Cult of Moloch's hideout he shot him and Professor Wilkins dead, with a gun he took from a guard he killed just moments before.
- Unknown number of Bosnian children.
- Other victims of Cult of Moloch, mostly as accomplice, but quite likely that a few may be directly (it is either him or Professor Wilkins who killed Kurt Wagner)